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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
import { createAbortError } from "./_util.ts";
/** * Make {@linkcode Promise} abortable with the given signal. * * @example * ```ts * import { *   abortable, *   delay, * } from "https://deno.land/std@$STD_VERSION/async/mod.ts"; * * const p = delay(1000); * const c = new AbortController(); * setTimeout(() => c.abort(), 100); * * // Below throws `DOMException` after 100 ms * await abortable(p, c.signal); * ``` */export function abortable<T>(p: Promise<T>, signal: AbortSignal): Promise<T>;/** * Make {@linkcode AsyncIterable} abortable with the given signal. * * @example * ```ts * import { *   abortable, *   delay, * } from "https://deno.land/std@$STD_VERSION/async/mod.ts"; * * const p = async function* () { *   yield "Hello"; *   await delay(1000); *   yield "World"; * }; * const c = new AbortController(); * setTimeout(() => c.abort(), 100); * * // Below throws `DOMException` after 100 ms * // and items become `["Hello"]` * const items: string[] = []; * for await (const item of abortable(p(), c.signal)) { *   items.push(item); * } * ``` */export function abortable<T>(  p: AsyncIterable<T>,  signal: AbortSignal,): AsyncGenerator<T>;export function abortable<T>(  p: Promise<T> | AsyncIterable<T>,  signal: AbortSignal,): Promise<T> | AsyncIterable<T> {  if (p instanceof Promise) {    return abortablePromise(p, signal);  } else {    return abortableAsyncIterable(p, signal);  }}
/** * Make Promise abortable with the given signal. * * @example * ```ts * import { abortablePromise } from "https://deno.land/std@$STD_VERSION/async/abortable.ts"; * * const request = fetch("https://example.com"); * * const c = new AbortController(); * setTimeout(() => c.abort(), 100); * * const p = abortablePromise(request, c.signal); * * // The below throws if the request didn't resolve in 100ms * await p; * ``` */export function abortablePromise<T>(  p: Promise<T>,  signal: AbortSignal,): Promise<T> {  if (signal.aborted) {    return Promise.reject(createAbortError(signal.reason));  }  const { promise, reject } = Promise.withResolvers<never>();  const abort = () => reject(createAbortError(signal.reason));  signal.addEventListener("abort", abort, { once: true });  return Promise.race([promise, p]).finally(() => {    signal.removeEventListener("abort", abort);  });}
/** * Make AsyncIterable abortable with the given signal. * * @example * ```ts * import { *   abortableAsyncIterable, *   delay, * } from "https://deno.land/std@$STD_VERSION/async/mod.ts"; * * const p = async function* () { *   yield "Hello"; *   await delay(1000); *   yield "World"; * }; * const c = new AbortController(); * setTimeout(() => c.abort(), 100); * * // Below throws `DOMException` after 100 ms * // and items become `["Hello"]` * const items: string[] = []; * for await (const item of abortableAsyncIterable(p(), c.signal)) { *   items.push(item); * } * ``` */export async function* abortableAsyncIterable<T>(  p: AsyncIterable<T>,  signal: AbortSignal,): AsyncGenerator<T> {  if (signal.aborted) {    throw createAbortError(signal.reason);  }  const { promise, reject } = Promise.withResolvers<never>();  const abort = () => reject(createAbortError(signal.reason));  signal.addEventListener("abort", abort, { once: true });
  const it = p[Symbol.asyncIterator]();  while (true) {    const race = Promise.race([promise, it.next()]);    race.catch(() => {      signal.removeEventListener("abort", abort);    });    const { done, value } = await race;    if (done) {      signal.removeEventListener("abort", abort);      return;    }    yield value;  }}